1) If he can handle judo, he can handle intervals.
2) Metabolic stress is, in fact, exactly what his body needs.
3) I approve of walking, bike rides, etc. because they're great for one's health, but they take a long time to have an effect on one's waistline.

That said, joint impact is a legitimate concern. My preferred activities for intervals (for many reasons that I can elaborate on upon request) are stationary cycling and rowing machines, and swimming is an intriguing alternative if one can perform it at a high enough relative intensity.

Please elaborate. Specifically, how would you suggest doing intervals, with a rowing machine, in tandem with Stronglifts.

As much detail as possible would be appreciated.

I do not aspire to be great, or even good, I hope to suck a little less then last class.

Please elaborate. Specifically, how would you suggest doing intervals, with a rowing machine, in tandem with Stronglifts.

As much detail as possible would be appreciated.

Intervals: Repeatedly alternating between periods of work and rest. In this context, a specific duration is chosen for all of the work periods and another duration is chosen for all of the rest periods. ("Rest" is generally active - still moving, but with much lower resistance and power output)

When you add the two together, you get a family of protocols that consist of alternating fixed-length periods of sustained >100% VO2max power output and rest. The specific programs vary by number of sets, work duration, rest duration, and power targets. Two of the more popular examples:

"HIIT": 4 sets of 30 seconds work/240 seconds rest at maximum instantaneous effort (go as hard as you can possibly go at all times)
"Tabata"*: 8 sets of 20 seconds work/10 seconds rest at/above a specific target power output - usually starting at about 170% of VO2max for the first workout, and increasing incrementally each workout.

Initially, I would recommend doing the former, because it's less complicated and a lot less taxing psychologically.

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Regardless of the protocol, warm up before you do your first work set.

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There is an "Intervals: Time" option on Concept2 rowers that will get the rower to time your work/rest periods for you.

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As far as fitting interval training together with StrongLifts 5x5, it really depends on:
-how much time/effort each trip to and from the gym takes
-how badly and how long each activity screws you up for the other

I'd hesitate to do the intervals immediately before the lifting, because if you have trouble during an interval, you perform a slower interval, but if you have trouble during squats, you might lose form and hurt yourself.

If you aren't trashed so badly from 5x5 that you can't bear to get on the rower, I'd say that you should try to hit a round of intervals after each weight training session. See how it goes.

Russ, curious as to why you recommend intervals when the goal is to burn more calories? My understanding is they are good for rapid gains in cardio fitness but calories is calories. Furthermore if the OP's cardio fitness isn't great some steady-state work is in order before tackling HIIT or something like that.

The effect of regular aerobic exercise on body fat is negligible; however, other forms of exercise may have a greater impact on body composition. For example, emerging research examining high-intensity intermittent exercise (HIIE) indicates that it may be more effective at reducing subcutaneous and abdominal body fat than other types of exercise

There is a TON of hype around HIIT. I just got back from a long weekend or I'd hunt down some of the research reviews showing how it's not any sort of magic bullet for fat loss, nor is it much better than steady state cardio. Names to look up there are Mark Young and Lyle McDonald off the top of my head.

What HIIT does do that steady state/low intensity doesn't is it makes people challenge their bodies. People who exclusively do lower intensity forms of exercise almost never actually work hard enough to not be able to talk. HIIT also allows for equal caloric burn in a shorter time frame, which is pretty great. It's likely that if you had to pick just one to do for conditioning purposes HIIT is the way to go, but thankfully you don't have to get married to ideas.

Certainly not knocking HIIT or any sort of interval training either. It's just another tool in the big bag of tricks. I'd go with whatever you enjoy the most, hate the least, or fits into your schedule best.

Overall, my cardio isn't bad. I'm rowing at 31-33 spm for a 14 minute session, immediately following a 5x5 session. I've been adding two minutes per session, with a goal of 30 minutes, at 31-33 spm.
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I do not aspire to be great, or even good, I hope to suck a little less then last class.

It is possible that you've put on six pounds of muscle in fourteen weeks, but not likely. I recommend you stop paying attention to the scale and start paying attention to how your belt fits; it's a much better proxy for body fat.

To start losing body fat:
-Replace your sugar and starch intake (rice/beans) with protein, saturated fat, monounsaturated fat, omega-3 fat, and fibrous vegetables (broccoli, cauliflower, lettuce, spinach, etc. - stuff yourself with these)
-Do high-intensity intervals 4-6x/week
-Be wary of very calorie-dense foods (macadamia nuts have a great lipid profile, but I've learned the hard way that it's way too easy to go through a pound of them in a sitting)